Receivables, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Affirmative Claim Recovery Estimate	$ 7,800	$ 8,800	$ 11,000
Total Gross Receivables	513,233	341,186	456,960
Allowance for Accounts, Notes, Loans and Financing Receivable, Current	481	364	272
Receivables, net	512,752	340,822	456,688
Back charges claims	9,300	6,500	0
Construction Contracts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	444,705	298,426	382,532
Completed and in Progress [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	347,320	206,756	300,188
Retentions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	97,385	91,670	82,344
Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	18,797	21,958	21,590
Non Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	78,588	69,712	60,754
Construction Material Sales [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	50,768	28,727	68,449
Other Business Products and Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	$ 17,760	$ 14,033	$ 5,979